drivers/infiniband/hw/ocrdma/ocrdma_ah.c

   1 /* This file is part of the Emulex RoCE Device Driver for
   2  * RoCE (RDMA over Converged Ethernet) adapters.
   3  * Copyright (C) 2012-2015 Emulex. All rights reserved.
   4  * EMULEX and SLI are trademarks of Emulex.
   5  * www.emulex.com
   6  *
   7  * This software is available to you under a choice of one of two licenses.
   8  * You may choose to be licensed under the terms of the GNU General Public
   9  * License (GPL) Version 2, available from the file COPYING in the main
  10  * directory of this source tree, or the BSD license below:
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  *
  16  * - Redistributions of source code must retain the above copyright notice,
  17  *   this list of conditions and the following disclaimer.
  18  *
  19  * - Redistributions in binary form must reproduce the above copyright
  20  *   notice, this list of conditions and the following disclaimer in
  21  *   the documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * Contact Information:
  36  * linux-drivers@emulex.com
  37  *
  38  * Emulex
  39  * 3333 Susan Street
  40  * Costa Mesa, CA 92626
  41  */
  42
  43 #include <net/neighbour.h>
  44 #include <net/netevent.h>
  45
  46 #include <rdma/ib_addr.h>
  47 #include <rdma/ib_mad.h>
  48 #include <rdma/ib_cache.h>
  49
  50 #include "ocrdma.h"
  51 #include "ocrdma_verbs.h"
  52 #include "ocrdma_ah.h"
  53 #include "ocrdma_hw.h"
  54 #include "ocrdma_stats.h"
  55
  56 #define OCRDMA_VID_PCP_SHIFT    0xD
  57
  58 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
  59                         struct ib_ah_attr *attr, union ib_gid *sgid,
  60                         int pdid, bool *isvlan, u16 vlan_tag)
  61 {
  62         int status = 0;
  63         struct ocrdma_eth_vlan eth;
  64         struct ocrdma_grh grh;
  65         int eth_sz;
  66
  67         memset(&eth, 0, sizeof(eth));
  68         memset(&grh, 0, sizeof(grh));
  69
  70         /* VLAN */
  71         if (!vlan_tag || (vlan_tag > 0xFFF))
  72                 vlan_tag = dev->pvid;
  73         if (vlan_tag || dev->pfc_state) {
  74                 if (!vlan_tag) {
  75                         pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
  76                                 dev->id);
  77                         pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
  78                                 dev->id);
  79                 }
  80                 eth.eth_type = cpu_to_be16(0x8100);
  81                 eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  82                 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
  83                 eth.vlan_tag = cpu_to_be16(vlan_tag);
  84                 eth_sz = sizeof(struct ocrdma_eth_vlan);
  85                 *isvlan = true;
  86         } else {
  87                 eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  88                 eth_sz = sizeof(struct ocrdma_eth_basic);
  89         }
  90         /* MAC */
  91         memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
  92         status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
  93         if (status)
  94                 return status;
  95         ah->sgid_index = attr->grh.sgid_index;
  96         memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
  97         memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
  98
  99         grh.tclass_flow = cpu_to_be32((6 << 28) |
 100                         (attr->grh.traffic_class << 24) |
 101                         attr->grh.flow_label);
 102         /* 0x1b is next header value in GRH */
 103         grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
 104                         (0x1b << 8) | attr->grh.hop_limit);
 105         /* Eth HDR */
 106         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
 107         memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
 108         if (*isvlan)
 109                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
 110         ah->av->valid = cpu_to_le32(ah->av->valid);
 111         return status;
 112 }
 113
 114 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
 115 {
 116         u32 *ahid_addr;
 117         int status;
 118         struct ocrdma_ah *ah;
 119         bool isvlan = false;
 120         u16 vlan_tag = 0xffff;
 121         struct ib_gid_attr sgid_attr;
 122         struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
 123         struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
 124         union ib_gid sgid;
 125
 126         if (!(attr->ah_flags & IB_AH_GRH))
 127                 return ERR_PTR(-EINVAL);
 128
 129         if (atomic_cmpxchg(&dev->update_sl, 1, 0))
 130                 ocrdma_init_service_level(dev);
 131         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
 132         if (!ah)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         status = ocrdma_alloc_av(dev, ah);
 136         if (status)
 137                 goto av_err;
 138
 139         status = ib_get_cached_gid(&dev->ibdev, 1, attr->grh.sgid_index, &sgid,
 140                                    &sgid_attr);
 141         if (status) {
 142                 pr_err("%s(): Failed to query sgid, status = %d\n",
 143                       __func__, status);
 144                 goto av_conf_err;
 145         }
 146         if (sgid_attr.ndev) {
 147                 if (is_vlan_dev(sgid_attr.ndev))
 148                         vlan_tag = vlan_dev_vlan_id(sgid_attr.ndev);
 149                 dev_put(sgid_attr.ndev);
 150         }
 151
 152         if ((pd->uctx) &&
 153             (!rdma_is_multicast_addr((struct in6_addr *)attr->grh.dgid.raw)) &&
 154             (!rdma_link_local_addr((struct in6_addr *)attr->grh.dgid.raw))) {
 155                 status = rdma_addr_find_dmac_by_grh(&sgid, &attr->grh.dgid,
 156                                                     attr->dmac, &vlan_tag,
 157                                                     sgid_attr.ndev->ifindex);
 158                 if (status) {
 159                         pr_err("%s(): Failed to resolve dmac from gid."
 160                                 "status = %d\n", __func__, status);
 161                         goto av_conf_err;
 162                 }
 163         }
 164
 165         status = set_av_attr(dev, ah, attr, &sgid, pd->id, &isvlan, vlan_tag);
 166         if (status)
 167                 goto av_conf_err;
 168
 169         /* if pd is for the user process, pass the ah_id to user space */
 170         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 171                 ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
 172                 *ahid_addr = 0;
 173                 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
 174                 if (isvlan)
 175                         *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 176                                        OCRDMA_AH_VLAN_VALID_SHIFT);
 177         }
 178
 179         return &ah->ibah;
 180
 181 av_conf_err:
 182         ocrdma_free_av(dev, ah);
 183 av_err:
 184         kfree(ah);
 185         return ERR_PTR(status);
 186 }
 187
 188 int ocrdma_destroy_ah(struct ib_ah *ibah)
 189 {
 190         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 191         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 192
 193         ocrdma_free_av(dev, ah);
 194         kfree(ah);
 195         return 0;
 196 }
 197
 198 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 199 {
 200         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 201         struct ocrdma_av *av = ah->av;
 202         struct ocrdma_grh *grh;
 203         attr->ah_flags |= IB_AH_GRH;
 204         if (ah->av->valid & OCRDMA_AV_VALID) {
 205                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 206                                 sizeof(struct ocrdma_eth_vlan));
 207                 attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
 208         } else {
 209                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 210                                         sizeof(struct ocrdma_eth_basic));
 211                 attr->sl = 0;
 212         }
 213         memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
 214         attr->grh.sgid_index = ah->sgid_index;
 215         attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
 216         attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
 217         attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
 218         return 0;
 219 }
 220
 221 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 222 {
 223         /* modify_ah is unsupported */
 224         return -ENOSYS;
 225 }
 226
 227 int ocrdma_process_mad(struct ib_device *ibdev,
 228                        int process_mad_flags,
 229                        u8 port_num,
 230                        const struct ib_wc *in_wc,
 231                        const struct ib_grh *in_grh,
 232                        const struct ib_mad_hdr *in, size_t in_mad_size,
 233                        struct ib_mad_hdr *out, size_t *out_mad_size,
 234                        u16 *out_mad_pkey_index)
 235 {
 236         int status;
 237         struct ocrdma_dev *dev;
 238         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 239         struct ib_mad *out_mad = (struct ib_mad *)out;
 240
 241         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 242                          *out_mad_size != sizeof(*out_mad)))
 243                 return IB_MAD_RESULT_FAILURE;
 244
 245         switch (in_mad->mad_hdr.mgmt_class) {
 246         case IB_MGMT_CLASS_PERF_MGMT:
 247                 dev = get_ocrdma_dev(ibdev);
 248                 if (!ocrdma_pma_counters(dev, out_mad))
 249                         status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 250                 else
 251                         status = IB_MAD_RESULT_SUCCESS;
 252                 break;
 253         default:
 254                 status = IB_MAD_RESULT_SUCCESS;
 255                 break;
 256         }
 257         return status;
 258 }